All insects

when cut in two continue to live, excepting such as
are naturally cold by nature, or such as from their minute size
chill rapidly; though, by the way, wasps notwithstanding their small
size continue living after severance. In conjunction with the middle
portion either the head or the stomach can live, but the head cannot
live by itself. Insects that are long in shape and many-footed can
live for a long while after being cut in twain, and the severed
portions can move in either direction, backwards or forwards; thus,
the hinder portion, if cut off, can crawl either in the direction of
the section or in the direction of the tail, as is observed in the
scolopendra.